Karen Hopkin | Jan 3, 1999 | 8 min read
to eliminate difficult-to-control pain while leaving normal sensation intact. Pain is a part of life. Often, a few painkillers and some rest are enough to soothe the scraped knees of childhood and the aches and sprains of adulthood. But for some, pain is not as fleeting or as easily dismissed. The pain from cancer, chemotherapy, arthritis, AIDS, and other diseases can be unrelenting and incapacitating. Some individuals even experience constant, bone-crushing pain for no apparent reason. For man